Slider



June 23, 1942. M. VOITY SLIDER Filed Sept. 16, '1940 ZSheetS-Sh eet 1MAURICE Von-Y ATTQRNEY.

INVENTIOR.

June 1942-v M. vorrY Y 2,287,362 1 SLIDER Filed Sept. 16, 1940 2Sheets-Sheet 2 NAURIQE VO/TY BY ATTORNEY.

. of the sheet.

Patented it... 23, 194a UNlTE D STATES PATENT OFF-ICE.

Maurice Voity, Long Island City, N. Y.,

Universal Slide Fastener Co. Inc.,

assignor to New York,

N. Y., a corporation of New York Application September 16, 1940, SerialNo. 356,899 3 Claims. (Cl. 24-205) The present invention relates tosliders for separable fasteners, and more particularly to such slidersmade of sheet material,

Sliders for separable or interlockingfasteners have heretofore been madein various ways. One type was formed of a single piece stamped out ofsheet metal. In this type, the stamped-out blank consisted of twoportions constituting the front and rear plates of the slider, joinedtogether by a web stamped or coined for reenforcement. In

forming the slider the two plate portions were bent towards each otheruntil they were spaced the proper distances apart and riveted or welded,the stamped or coined web becoming a neck holding the front and rearplates in position. It has been found that such construction resulted inthe two plates, even though spaced by reenforc ing wings, oftentimes notbeing properly parallel or spaced apart, while the bending operationweakened the neck, and under hard usage the plates were readily. twistedout of relationship.

Another type of slider was formed of separate front and rearplates'stamped from sheet material by diiferent dies. n the one hand, inearlier times, the plates were spaced by heading a separating rivet,while in later devices the separating rivet or block was weldedto theplates. This type of slider entailed the useof different dies for thefront and rear plates and the separator head, and bulky in conformation.

In addition to the foregoing disadvantages of the prior art it has beenfound that during the manufacture of sliders from sheetmetal burrs areformed when the blanks are stamped out An additional trimming operationwas usually necessary to remove these burrs, adding to the cost ofmanufacturing the sliders'.

It is among the objects of the present invention to provide a slider,the front and rear plates of which are automatically properly spaceddurin manufacture, and are rigidly connected together so that even underconditions of hard usage they remain properly aligned and spaced.

Another of the objects 'of the present invention is to provide a novelslider, the front and rear plates of which are similar, being formedfrom a strip with the same die and operations.

Still a further object ofthe present invention is to provide a novelslider construction, which is relatively simple and inexpensive. A Theseand further objects, advantages and capabilities of the presentinvention will be-' come more apparent from the following description ofa preferred embodiment, illustrated in the drawings, in which:

' predetermined distance and slider plates proper.

Figure 2 is a separated view, in perspective, of

the front and rear plates of the slider illustrated in Figure 1.

Figure 3 is a plan view of.a sheet of material from which the slideristo be formed.

Figure 4 is a plan view of the same sheet after it has been grooved,prior to the die punching operations.

Figure 5 is a section taken through the grooves, taken along the line5-5 of Figure 4.

Figure 6 is a plan view of the successive slider plate blanks stampedoutof the sheet.

Figure '1 is a plan view of the stamped blanks after'flanges or guidetracks have been punched therein.

Figures 8 and 9 are sections through a die-operating on a plate blank,for forming the flanges therein.

Figure 10 is a punched slider plate tab loop has been formed. I

Figure 11 is an enlarged cross-section through a plate taken on the linell-ll of Figure 10.

plan view of the stamped and Figure 12 is a plan view of the blanks ofFig- Figure 13 is an enlarged cross-section taken along the line l3-|3through a slider plate of Figure 12.

Referring now to Figures 1 and 2, slider 20 is constructed with a frontplate 2| and a rear plate 22 which are similar; and spaced by apredetermined distance. At one end of slider 20 are two divergingoutlets 23, 23 arranged between spaced opposed flanges 24, 24 andcentral formation 25 joining the front and rear plates. Flanges 24converge towards the rear end 26 of the slider, merging with parallelflanges 21, 21. The opposed edges of flanges 24, 24 are spaced aarranged to permit the tapes of a separable fastener to readily sliptherethrough while the fastener elements are confined within the slider.

An important feature of the present invention is the novel constructionof the slide fasteners,

permitting rigid assembly of two similar components with predeterminedspacing and aligninent. Integral triangular tongues or projecjections 28and 28' .of the respective slider plates 2| and 22 are bent inwardly ofthe plates, as illustrated in Figure 2. The thickness of triangularportions 28, 28' is the same as that of the The two slider sections arejoined together across triangular portions 28, 28',

blanks in which a pulling a narrow strip from the center.

preferablyby welding. The interior spacing between front and back plates2| and 22 becomes substantially twice the thickness of the sheet ofwhich the plates are formed defining the required width foraccommodating the slide fastener elements. A substantially broad area ofor web 29' is formed on the underside of the loop. The pull tab (notshown), which is manually grasped to move the slider, is secured to loop29 and is slidably pivoted and guided thereon in the conventionalmanner. I

In accordance with the present invention, front and rear plates 2|, 22are similarly constructed. except that an additional step is used toform loop 29 in front plate 2|. The plates are successively formed in ablank strip 39 of suitable material, illustrated in Figure 3, in whichV- shaped grooves, such as shown in Figure 5, are stamped inpredetermined shapes for the individual plates. For each slider platethere is a groove 3|, transversely'of the sheet; two parallel grooves 32at right angles to the extremities of transverse groove 3|; twodiverging grooves 33 connecting with grooves 32; and convergin grooves34 connecting with grooves 33. The outer ends of converging grooves 34are a predetermined distance apart.

The next step in forming the slider plates is the stamping of the blanksto the shape indicated nection with Figures 1 and2. This is accomplishedby. inverting and placing the stamped blanks of Figure 6 in die 31, 18as shown in Figure 8. Female die portion 31 has a flat bottom 38,beveled bottom edges 39, and vertical sides. The punch or male dieelement 48 forces blank 2| into die member 31, as shown in Figure 9,formingangularly directed flanges or tracks 24 leading to straightflanges or tracks 21, and beveled edges 4| at the bottom of the blank.In the coining action of the dies the blank now takes on the appearanceillustrated in Figures '7 and 9, wherein the metal displaced'in suchoperation is urged upwardly in reduction of the slope of the bevel fromthat originally indicated as a in Figures 4 and 8 to that indicated as bin Figures 7 to 9; the outer surface of tracks or flanges 24 and 21being maintained in straight and smooth contour as the metal flowsupwardly in Figure 9 to form the relatively reduced but neverthelesssmooth bevel b, The punching or coining, al-

A guide rib- 2,'se7,sea V though shown insofar as it relates to onesection.

ofasliderinl 'igureihisdoneforthe entirewall or track structure for eachslider. and may be carried out in multiple for the successive sliders toprovide the connected assembly shown in Figure 7. 1

By virtue of the formation of the beveled edges defined as a in Figure 4and the transposition during the coining operation illustrated in Figure8 of all the displaced metal in reduction of the beveled edge to theconformation indicated as track 24 'or 21, since all excess metal isdisplaced ,and flows in the reduction of the bevel asinb' in Figure 7,there is eliminated any formation of burrs or flash at the edges of theflange or dicated. The track or flange structure of the slider, asindicated in Figures 7 and 9, therefore has smooth wall surfaceformations both interiorly and exteriorly. Although a particularconformation of the chamfer defining the grooves in Figure 4 and thebeveled edges of Figure 8 prior to coining is indicated as a preferredembodiment, it is within the province of my invention to vary thecontour of the'chamfer and the'depth of the groove shown in section inFigure 5, so

that as the coining operation is carried out in; the manner illustratedin Figures 8 and 9, the

flow of metal will be along the exterior of the flange or trackinextension of the wall surface and reduction of the beveled edgedeflned by the chamfer.

The individual slider plates 2| (or 22) are separated along the apex oftransverse V-groove 3|. The tongue 35 is cut oi! at its triangle apex,while tail-pieces 38 are detached, as indicated by the dotted lines ofFigure '7. Projecting tongues 33 are thereupon bent-over inwardly toform the triangular projections 28, 28' of plates 2|, 22, as illustratedin Figure 2.

It is to be understood that the front and back slider plates 2| and 22,in accordance with the invention, are constructed with similaroperations and the same tools and dies. Only one additional operation isrequired for completing the front or upper slider plate 2|, namelytheformation of loop. Loop 29 may be added to plates 2| while they are inthe successive string formation, corresponding to the showing of Figure6 or 10; or after separation, corresponding to the assembly shown inFigure '7.

A central punching operation outwardly of plate 2| causes loop 29 toproject on the front side. Figures 10 and 11 illustrate the result ofsuch operation. The inner edges of loop 29 are I then swaged at 42, 42to form inner central rib 29' shown in cross-sectional Figure 13. Ribs29' and swaged'edges 42, 42 may also be seen in the partially formedslider plates 2| of Figure 12.

The severing of tail-pieces 38 to complete the individual sliders is aspreviously described in connection with Figurefl.

The slider construction is completed by arranging tongue 28 of one frontplate 2| and tongue 28' of one rear plate as against each other, asindicated in Figure 2 and shown in Figure 1. The tongues 28, 28' arethereupon welded or otherwise suitably fastened together. The thicknessof tongues 28, 28' determine the spacing of the-plates, designed so thatfastener elements will readily pass between them. he height of theflanges 24 is-predetermined to allow for the passageof the separabletapes between the opposed edges of the flanges, being somewhat lessaae'nsea is to he understood that changes andmodiflcations may he madeto its details of construction without departing from the general spiritand scope of the invention as set forth in the appended claims. p

I claim:

1. A slider for separable fasteners comprising separate front and rearplates, each having perpendicularly-directed guide tracks, an inwardlybent triangular tongue integral with and projecting'from an end of eachof said plates disposed in parallelism with and extending against itscorresponding plate with the'apex of each tongue triangle directedlongitudinally of the slider, said plates and tongues beingsymmetrically juxtaposed and the respective tongues sesaid platesrelative to each other.

2. A slider for separable fasteners comprising separate'front and rearplates of sheet material, each having perpendicularly-directed guidetracks, an inwardly bent tongue integral with each of said plates, eachsaid tongue being of the same thickness as the plate sheet materialcured to each other to rigidly space and hold and disposed inparallelism with and extending against its corresponding plate, saidtongues being secured to each other for predeterminedly spacing andholding said plates relative to each other, said guide tracks being lessin height than the tongue thickness whereby the opposed ends of theflanges are spaced from each other.

3. A slider for separable fasteners comprising separate front and rearplates of sheet material,

each having perpendicularly-directed guide tracks, an inwardly bentsubstantially triangular tongue integral with and projecting from an endoffleach of said plates, each said tongue being of the same thicknessasthe plate sheet material and disposed in parallelism with andextending against its corresponding plate with the apex of each tonguetriangle directed longitudinally of the slider, said plates and tonguesbeing symmetrically arranged against and secured to each other acrossthe tongues thereof to predeterminedly space and hold said platesrelative to each other, said guide tracks" being less in height than thetongue thickness whereby the opposed ends of the flanges are spaced fromeach other. MAURICE VOI'I'Y.

